Vodafone India — postpaid bill for the number that I am not using anymore

Address:

Hyderabad, Andhra Pradesh, 500081

This is to complain against Vodafone India, as they have been sending mails and calling my alternate numbers asking to pay bills for the number I no longer possess. I have paid the bills and settled, closed the account with Vodafone in October and they still bother me with improper communication, threatening me that they will send demand notice and sue me.